The 'C' Incision Wound

BANG!

There was a mass shooting in a residential area just two hundred meters from Highyl's Apartment. 

The shooting occurred in the middle of the night when everyone was fast asleep to recover their energy for tomorrow's activities. 

At least nineteen people have died from gunshot wounds to the head. However, the strangest thing is that the killer killed them all in their house while asleep. 

No gunshots sounded when the killer killed them, other than the last shot directed at a pedestrian who accidentally passed in the area, leaving his head shattered. 

That last shot shocked everyone before they finally got out of the house and found that a small part of the residents had been shot dead in their mattresses. 

Police placed a perimeter on the area and did not allow anyone else to enter the site before they completed the investigation. As a result, the police found a gun that had a silencer thrown near a garbage can.